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When I open my curve tool I find there is a vertical line with the label 'x:193' where the number is a position on the horizontal axis. This position is never the same i.e. it varies from one image to another. I've tried to deduce what it means but am at a loss. Gimp context help provides no clues. Any suggestions?
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Which version of linux are you using and which version of Gimp?
(12-16-2017, 08:46 AM)rich2005 Wrote: [ -> ]Welcome to gimp-forum.net

Which version of linux are you using and which version of Gimp?

Thanks rich2005

version 2.8.16 

Typically after puzzling over this for a while I happened upon the answer myself immediately after asking the question! 
It seems to be that the x: marks the value of the point on the image where I click to open the curves dialogue. If I select curves from the colour drop-down menu the vertical line doesn't appear.
Yes, actually very useful for accurate work. You can re-click on the canvas to get the value for another pixel...